Throttle/Pedal Position Sensor B/C Voltage Correlation
Code P2137 indicates a correlation error between the throttle position sensor (TPS) B and C circuits, or between the accelerator pedal position sensor (APP) B and C circuits. The PCM detects that the voltage signals from these sensors do not match within a specified range, often due to a faulty sensor, wiring issues, or a defective throttle body. This can cause improper throttle response and reduced engine performance.
1. Most Common Causes
- Faulty or internally worn accelerator pedal position (APP) sensor
- Faulty throttle position sensor (TPS)
- Short to ground, short to battery, or open circuit in signal circuits B or C
- Loose, corroded, or damaged connectors at the sensor or PCM
- Internal PCM failure (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor acceleration or hesitation
- Erratic idle or stalling
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect wiring and connectors for damage or corrosion.
Step 3: Test sensor voltage signals with a multimeter per manufacturer specs.
Step 4: Check throttle body for carbon buildup and clean if necessary.
Step 5: Replace faulty sensor or throttle body if tests indicate failure.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended as the vehicle may enter limp mode, reducing power and potentially causing unsafe driving conditions.
How much does it cost to fix?▼
Typical repair costs range from $50 to $150 for sensor replacement, but can be higher if throttle body replacement is needed.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.